[8u] RFR: 8196681: Java Access Bridge logging and debug flags dynamically controlled

[Zhengyu Gu]

>>>>>
>>>> Would this whole + part calculation just (counter * milliDen) / 
>>>> freq? or you are worry about overflow?
>>>>
>>>> Otherwise, looks good to me.
>>>
>>> Thanks for the review!
>>>
>>> Yes, overflow here doesn't matter for milliseconds, but will happen 
>>> if nanoseconds are used.
>> Okay, a comment will be good.
> 
> Added a comment:
> 
> +    // prevent possible overflow
> +    long long whole = (counter / freq) * milliDen;
> +    long long part = (counter % freq) * milliDen / freq;
> +    return whole + part;
> 
> Full webrev just for the record: 
> http://cr.openjdk.java.net/~akasko/jdk8u/8196681/webrev.01/
> 
> All other changes to original patch, besides 
> AccessBridgeDebug#getTimeStamp() above, are either path changes or 
> string literal changes in debug messages.

Looks good.

Thanks,

-Zhengyu

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